Improvement in wood-grinders for paper-pulp



` u A. FICKEN.

WOOD-G-RINDERS FOR RASEE-PULP.

No, 194,591. .Y Patented Aug. 28,1877;-`

N. PETERS, PHUTO-LITHOGRAFHER- WASHINGTON` D UNITED STATES PATENTOFFICE.

ALBERT FICKETT, OF ROCHESTER, NEW YORK, ASSIGNOR OF ONE-HALF HIS RIGHTTO SENECA DOBBS, OF SAME PLACE.

' IMPROVEMENT IN WOOD-GRINDERS FOR PAPER-PULP.

Specification forming part of Letters Patent No. 04,591 datedAugust 28,r1877 application filed July r., 1877.

To all whom it may concern:

Be it known that I, ALBERT FIOKE'IT, of Rochester, in the county ofMonroe and State of New York, have invented a new and useful Machine forGrinding Wood into Paper Stock; and I do hereby declare that the fol.-lowing is a full, clear, and exact description thereof, reference beinghad to the accompanying drawings, making part of this specification, inwhich- Figure 1 is a top or plan sectional view of my invention. Fig. 2is an end elevation of the same, lookingin the direction of the arrow inFig. l.

The object of my invention isV to disintegrate fiber from wood forpaper-stock-,in a more simple, rapid, (with a given amount of power,)

and economical manner thanheretof'ore prac-v ticed.

Itsy nature consists in a peculiar construction of a grinding apparatusfor that purpose. The cylindrical shell A is formed vupon the hollowshaft A', or it may be made separate.

It is driven by the pulley P, and is provided inside with one or moreannulars, C, of stone, having their inner surface corrugated orchanneled either longitudinally or spirally. The flange or collar Bholds the `stones or annulars C in place by being secured by bolts, orotherwise, to the open end of the cylindrical shell` A.

The annulars C are rmly secured within the cylinder A by screw-bolts s.If preferred, they `might be held in pla'ce by several dowels in thefixed head H, and the flange B, and in each alternate annular.

The shaft A', Fig. 1, revolves in pillow-blocks S, which are attached tothe bed-plate G.

The table D is suspended within the grinding-cylinder from the standardS', and as near as practical to the grinding-surface, in order toprevent the separation 4of slivers from the strips instead of bers.

The guides c are attached to this table, and are made adjustablelaterally at their outer end by clamping-screws c. By this means thewood may be presented to the grinding-snrface, more or less diagonally,across the grain, as may be desired.

The plate F is xed to the bar E, which is attached to the table D. Thisplate is hung at a proper distance above the table to admit or receivethe strips of wood in the space formed between vthem and the guides c,and the grinding-surface. This plate F acts as a table on Vthe sideWhere the grinding-surface is moving upward, and keeps the strips thatare being ground in place, and, as in the case of the table D, must justclear the grindingsurface for the same purpose.

The size of the strips of wood may be one and a halt' by three inches,and of any con- Venient length. Cuttings of less size may be placed,several together, on the table and ground, and thereby save cutting andwaste, which is lost in the use ot' other pulp-grinding engines.

The water-pipe T is inserted into the machine through the hollow shaftA', and that portion within the machine is perforated, to admit of aconstant shower being thrown within the machine to free thegrinding-surface, and all parts within the cylinder from the groundstock. The passage ot' this current of water through the pipe in thehollow shaft A', keeps it from heating, which would otherwise be veryliable to occur.

^ A much higher speed can be sustained, with safety, in this machine,than in other woodgrinding or pulp-engines employing a stonegrindingsurface, the stones in this case being thoroughly prevented by the shellA from displacement or bursting by the centrifugal force.

1t will be seen that, by employing a concave grinding'surface the edgesof the strips acted upon are thereby ground cylindrical or convexinstead of concave in cross-section, as

.heretofore practiced, and this form renders them much stronger as theybecome reduced, and consequently scarcely ever liable to break olf inslivers at all, they being wholly reduced to fibrous pulp.

Any suitable feeding apparatus, to be operated automatically, orotherwise, may be used.

What I claim as my invention is l. As an improvement in Wood-pulpingengines or grinders, the cylindrical case or shell A, provided with oneor more stone annulars,

C, constructed and arranged to operate subl end made adjustable,substantially as shown stantially in the manner and for the purposes land described, for the purpose of permitting set forth. the Wood to bepresented more or less diago- 2. In combination with the grinding-cylinnally to the grinding-surface, as set forth. der, constructedsubstantially as shown and described, the table D, and guides or gagesc, ALBERT EHKETT' for the purposes set forth. Witnesses:

3. In combination with the internallygrind- WM. S. LOUGHBOROUGH, ingcylinder, the guides c, having their outer J. M. HOWE.

